1
Overview
The
expansion board is a comprehensive tool designed for the evaluation of
analog MEMS microphones.
It features:
•
3 on-board
•
5 slots to plug analog microphone coupon boards (e.g.,
•
Synchronized acquisition and streaming of up to 4 microphones
•
Amplification stage based on TSV91x wide bandwidth operational amplifiers
•
On-board external ADC
•
Direct acquisition of a single microphone exploiting STM32 embedded ADC
•
Up to 192 KHz sampling frequency
•
Free comprehensive development firmware library and audio capture plus USB streaming sample
application compatible with
•
Compatible with
•
Equipped with ST morpho connectors (top and bottom) and Arduino UNO R3 connectors (top) to allow
stacking of multiple boards
•
RoHS and WEEE compliant
The
expansion board implements an amplification stage for each microphone, based on
TSV91x operational amplifiers, and allows microphone recording using either a dedicated third-party external
analog to digital converter, mounted on-board, or the embedded STM32 ADC.
Figure 2.
X-NUCLEO-AMICAM1, STM32 Nucleo and STEVAL-MIC004V1 stack
As shown in the figure above, three microphones are mounted on the
of them (M1OB, M2OB) are connected to the external ADC while the third one (M3OB) is directly connected to
STM32 embedded ADC.
Five additional headers are available for external analog microphone coupon boards (e.g.
).
The external ADC is controlled through a SPI interface.
UM2649
Overview
UM2649
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Rev 2
page 2/18
